Mechanism for actuating guide-rolls



(No Model.) 4 Sheets-Sheet 1.'

R. SMITH.

MEGHANISM POR AGTUATING GUIDE ROLLS. No. 395,253. Patented Deo. 25, 1888.

(No Model.) v 4 Sheets-Sheet 2.

Y R. SMITH.

MEGHANISM POR AGTUATING GUIDE ROLLS. No. 395,253. Patented Dec. 25, 1888.

(No Model.)

R.S,MITH.

MEGHANISM FOR AGTUATING GUIDE ROLLS.

No. 395,253. Patented Dee. 25, 1888,.

J ,d f1 d j f l) C "j elmfcmeooae Queen/015 4 Sheets- Sheet 4. R. SMITH. VMB(NEIAIJVISM POR AGTUATING GUIDE ROLLS.

Patented Deo. 25, 1888.

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(No Model.) l

FFICE.

RICHARD SMITH, OF BOSTON, MASSACHUSETTS.

MECHNISIVI FOR ACTUATING GUIDEHROLLS.

SPECIFICATION forming part of Letters Patent No. 395,253, dated December 25,1888.

i Application filed May 7, 1887. Serial No. 237,410. (No model.)

T0 all whom it may concern:

Be it known that I, RICHARD SMITH, a citizen of the Dominion oit Canada, residing at Boston, in the county ot' Suffolk and State oil' Massachusetts, have invented certain n eW and useful Improvements in Mechanism for Actuating Guide-Rolls; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as Will enable Others skilled in the art to which it appertains to make and userthe same, reference being had to the accompanying` drawings, and to letters or figures of reference markedA thereon, Which form a part of this speciiication.

This invention relates to mechanism i'or automatically actuating guiderolls, b y means of which the direction in the travel of an endless apron-such as drier or wet telts or a wireclotl1-1nay be controlled, such movements of the guiderolls being caused by the edges of the apron and due to the divergence of the latter from its normal path ofV travel.

This invention is an improvement on that described in Letters Patent of theUnited States No. 339,703, issued to myself on the 13th day of April, l SSG. In thatinvention the guideroll was mounted upon a sliding car- 1'iage,\vl1ich was thrust cndivise in either direction by the operation ot' two pawls hung upon a rockin shield, and which engaged a toothed gear. This latter gear rotated a pinion which meshed vwith a lined rack upon the machine-frame, While the'rocking movement of the shield was caused by a Vtace-plate upon one end ot' theroll, the position of which was shifted and altered by the pressure ot the edge ot' the endless apron against featherbars. Intercomiccting mechanism from the latter tilted the shield, and thus brought one of the pawls into active service, dependent upon the direction in which the thrust from the apron was exerted. In that construction it will be readily understood that both pawls are inactive only when the rocking shield ishorizontal and not tilted one way or the other; but as this occurred only at the time when the endless apron was traveling directly at right angles to the longitudinal axis of the guide-roll,\vhich interval in practice seldom occurs, it was found that the felt or endless apron was being actuated unnecessarily by the operating mechanism.

` by the shifting of the roll, when if said shift is sufficient no further advance is made in this direction; but should this change not suffice and the pressure vfrom the traveling apron be continued, said pawl is again rendered active and a further slight alteration is eitected, When the paivl again becomes inactive.

The drawings accompanying this specification represent, in Figure l, a side elevation. Fig. 2' is a plan; Fig. 3, an end elevation of devices for automatically actuating guiderolls, and which embodies my invention. Fig. 4 is a transverse section al elevation through plate I. Fig. 5 is a general plan of the mechanism as applied in connection with the felt of a paper making' machine. Fig. C represents a perspective view of the mechanism as a Whole. Fig. -7 represents a detail elevation of the rear Jfeather-bar an d the pivotal mounting of bar 72.

In said drawings I have represented at'A a housing or standard to be rigidly aliiXed or bolted to one side (the liront) ot' the frame of a paper-machine. (ot shown.) This standard is T-shaped in general cross-section in a plane parallel to sha tt d, and is composed of a vertical web, l-l, and two lateral ones, O D,

Which are disposed parallel with the side of IOO oted to a fixed part of the frame, while the other journal, d, is mounted in the carriage Il, the latter being provided with an undercut groove, l, to grasp the upper and under faces of the web D before mentioned, upon which it is free to move endwise in the act of shifting the position of the roll to operate the endless apron or felt.

To prevent continuons action of the pawls with respect to the toothed vrack S, I have erected midway between the webs (l D and parallel therewith a guide-plate, I, slotted at I), Fig. 4. A shield, J, so called since it covers the teeth a a of the rack, is mounted on rollers ff, which travel in said slot when the lateral thrust .upon the feather-bars is transmitted thereto. This thrust is caused by the pressure of the wire, cloth, or felt. A rod, 71, extends transversely across the machine and is furtherprovided with the featherbars g g. (See Fig. One end of this rod is pivoted, as shown in the patent above alluded to, while the other end is secured lo a bell-lever, fr', pivoted upon the frame I), and united by the rod j, pi votally attached at to the shield. 'lhe rod is also pivotally attached to said bell-lever fi. Reciprocations of the said rod thus cause the shield .l to slide, and the latter permits one of the pawls, by withdrawing from beneath it, to drop upon the rack S and engage its teeth a. The continuous rotation of the guii'le-roll G actively thrusts the carriage Il endwise by means of the now active pawl. lVhen the latter has advanced itself into contact with the shield, it is lifted up by the said shield and rondt-red inactive, while the carriage Il is stopped.

The operation of the above mechanism is as follows: Presumingl the parts are as shown in the drawings with the guide-roll rotating as indicated byarrow l, (see Fig. l,) the felt is also diverging, as shown by arrow 3, lfig. 2. In such event the pressure of the felt or wire cloth is against one of the featl1erbars g, while the rod 7L will be thrustin the direction of arrow 4c. The effect of this will be, by aid of the bell-lever i and rod j, to move the sliding shield J in direction of arrow 5 and to withdraw it from beneath the pawl IF, which then drops into contact with the teeth a of. the rack S. Since the latter is a fixture the carriage II is forced to move in the same direction as the shield, while the axis of the guide-roll is canted to shift the felt and cause it to diverge in a contrary direction. The guide-roll can now make but a few revolutions before the pawl F has thrust the carriage II to such a position that the pawl is in contact with and rests upon the shield, and all the parts now remain. .inacti ve until further divergence of the felt in the direction of arrow 5 has-againadvaneed the shield to permit activity of the pawl to cant the guideroll still more. This intermittent action repeated successively until the divergence ofy the felt one way is counteracted by the obliquity in the axis of the roll oppositely. The

advantages of this intermittent feed motion will be seen from the fact that after the roll is shifted a pause or interval ensues vto allow the felt to be influenced before any further change in the same direction is effected. Moreover, the parts are not in constant action and there is less opportmiity for wear and consequent deterioration. To prevent accidental movement of the guide-roll after being' shifted, andso maintain its adjusted position, I have disposed' on the lower part of the carriage a friction-clamp, p, adjustable by means of the screen 3. By these means all movements of the carriage and guide-roll are prevented except such as are produced by the action of one or the other of the pawls, and this resistance to accidental movements is effected without increasing the strain or work upon the belt or apron, since the latter is simply required to slide the shield J, which is mounted on the rollers and offers but little resistance to the movements of the said apron. A resistance occasioned by the clamp p is sustained and overcome bythe pawls and the actuating guide-roll.

I claiml. The combination of a Afixed rack, a carriage movable longitudinally thereof, a guideroll having one of its journals mounted in said carriage, a pivoted bearinfor the other journal of said roll, and an endless apron traveling over said roll, with two pawls reversely inclined and carried by the :former journal of said roll, a movable shield which normally holds said pawls out of engagement with said rack, and devices connecting with said shield and extending to the edge of the apron in order that any lateral motion of said apron may move them and cause them to move the shield from below one of the pawls, for the purpose set forth.

2. A guide-roll, a pi voted bearing for one of its journals, a carriage in which the other journal is mount ed, devices for actuating` said carriage, a fixed web, and a friction-brake attached to said carriage and bearing against said web to prevent accidental motion of said carriage, substantially as set forth.

S. The combination ofk guide-roll G, a pivoted bearing for one journal thereof, a carriage in which the other journal is mounted, two opposite inclinedA pawls carried by the latter journal, a fixed rack under said pawls, a movable shield which normally holds said pawls out of engagement, the endless apron IOO IIO

traveling over said roll, the 'feather-bars opsaid apron causes shield to move longitudt ISO nally of said rack, a pivoted hearing` for one Carriage overtakes Said shield, Sulrisi'antally journal of said roll, and a carriage for lche as Set forth. Io other journal of Said roll, a pair of inversely- In testimony whereof I affix my signature in inclined pawls carried by the latter journal presence of two Witnesses.

5 and arranged above said Shield in order that RICHARD SMITH.

one of said pawls may drop into engagement lVtneSSes: with the rack when the shield moves toward H. E. LODGE,

the other pawl and be lifted again when the E. K. BOYNTON. 

